US8088815B2 - Spiroindolinone pyrrolidines - Google Patents

Spiroindolinone pyrrolidines Download PDF

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US8088815B2
US8088815B2 US12/939,234 US93923410A US8088815B2 US 8088815 B2 US8088815 B2 US 8088815B2 US 93923410 A US93923410 A US 93923410A US 8088815 B2 US8088815 B2 US 8088815B2
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chloro
phenyl
fluoro
oxo
dihydro
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US20110130398A1 (en
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David Joseph Bartkovitz
Xin-Jie Chu
Qingjie Ding
Bradford James Graves
Nan Jiang
Jing Zhang
Zhuming Zhang
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Hoffmann La Roche Inc
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Hoffmann La Roche Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/10—Spiro-condensed systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A61K31/407—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with other heterocyclic ring systems, e.g. ketorolac, physostigmine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

  • the present invention relates to spiroindolinone pyrrolidines I which act as antagonists of mdm2 interactions and hence are useful as potent and selective anticancer agents.
  • the present compounds are of the general formula
  • p53 is a tumor suppresser protein that plays a central role in protection against development of cancer. It guards cellular integrity and prevents the propagation of permanently damaged clones of cells by the induction of growth arrest or apoptosis.
  • p53 is a transcription factor that can activate a panel of genes implicated in the regulation of cell cycle and apoptosis:
  • p53 is a potent cell cycle inhibitor which is tightly regulated by MDM2 at the cellular level. MDM2 and p53 form a feedback control loop. MDM2 can bind p53 and inhibit its ability to transactivate p53-regulated genes. In addition, MDM2 mediates the ubiquitin-dependent degradation of p53.
  • MDM2 can activate the expression of the MDM2 gene, thus raising the cellular level of MDM2 protein.
  • This feedback control loop insures that both MDM2 and p53 are kept at a low level in normal proliferating cells.
  • MDM2 is also a cofactor for E2F, which plays a central role in cell cycle regulation.
  • MDM2 The ratio of MDM2 to p53 (E2F) is dysregulated in many cancers. Frequently occurring molecular defects in the p16INK4/p19ARF locus, for instance, have been shown to affect MDM2 protein degradation. Inhibition of MDM2-p53 interaction in tumor cells with wild-type p53 should lead to accumulation of p53, cell cycle arrest and/or apoptosis. MDM2 antagonists, therefore, can offer a novel approach to cancer therapy as single agents or in combination with a broad spectrum of other antitumor therapies. The feasibility of this strategy has been shown by the use of different macromolecular tools for inhibition of MDM2-p53 interaction (e.g. antibodies, antisense oligonucleotides, peptides). MDM2 also binds E2F through a conserved binding region as p53 and activates E2F-dependent transcription of cyclin A, suggesting that MDM2 antagonists might have effects in p53 mutant cells.
  • the present invention relates to pyrrolidine-2-carboxamide derivatives I which act as antagonists of mdm2 interactions and hence are useful as potent and selective anticancer agents.
  • the present compounds are of the general formula
  • a benzodioxyl group halogen, hydroxy, CN, CF 3 , NH 2 , N(H, lower-alkyl), N(lower-alkyl) 2 , aminocarbonyl, carboxy, NO 2 , lower-alkoxy, thio-lower-alkoxy, lower-alkylsulfonyl, aminosulfonyl, lower-alkylcarbonyl, lower-alkylcarbonyloxy, lower-alkoxycarbonyl, lower-alkyl-carbonyl-NH, fluoro-lower-alkyl, fluoro-lower-alkoxy, lower-alkoxy-carbonyl-lower-alkoxy, carboxy-lower-alkoxy, carbamoyl-lower-alkoxy, hydroxy-lower-alkoxy, NH 2 -lower-alkoxy, N(H, lower-alkyl)-lower-alkoxy, N(lower-alkyl) 2 -
  • Preferred substituents for the cycloalkyl, cycloalkenyl, aryl, heteroaryl and heterocycle rings are halogen, lower alkoxy, lower alkyl, hydroxycarbonyl, carboxy, carbamoyl, aminocarbonyl, carboxy lower alkoxy, oxo and CN.
  • Preferred substituents for alkyl are alkoxy and N(lower alkyl) 2 .
  • alkyl refers to straight- or branched-chain saturated hydrocarbon groups having from 1 to about 20 carbon atoms, including groups having from 1 to about 7 carbon atoms. In certain embodiments, alkyl substituents may be lower alkyl substituents.
  • lower alkyl refers to alkyl groups having from 1 to 6 carbon atoms, and in certain embodiments from 1 to 4 carbon atoms. Examples of alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, t-butyl, n-pentyl, and s-pentyl.
  • cycloalkyl is intended to refer to any stable monocyclic or polycyclic system which consists of carbon atoms only, any ring of which being saturated
  • cycloalkenyl is intended to refer to any stable monocyclic or polycyclic system which consists of carbon atoms only, with at least one ring thereof being partially unsaturated.
  • cycloalkyls include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, adamantyl, cyclooctyl, bicycloalkyls, including bicyclooctanes such as [2.2.2]bicyclooctane or [3.3.0]bicyclooctane, bicyclononanes such as [4.3.0]bicyclononane, and bicyclodecanes such as [4.4.0]bicyclodecane (decalin), or spiro compounds.
  • cycloalkenyls include, but are not limited to, cyclopentenyl or cyclohexenyl.
  • alkenyl as used herein means an unsaturated straight-chain or branched aliphatic hydrocarbon group containing one double bond and having 2 to 6, preferably 2 to 4 carbon atoms.
  • alkenyl group examples include vinyl, ethenyl, allyl, isopropenyl, 1-propenyl, 2-methyl-1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-ethyl-1-butenyl, 3-methyl-2-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 4-methyl-3-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl and 5-hexenyl.
  • alkynyl as used herein means an unsaturated straight-chain or branched aliphatic hydrocarbon group containing one triple bond and having 2 to 6, preferably 2 to 4 carbon atoms.
  • alkynyl group examples include ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 1-hexynyl, 2-hexynyl, 3-hexynyl, 4-hexynyl and 5-hexynyl.
  • halogen as used in the definitions means fluorine, chlorine, bromine, or iodine, preferably, fluorine and chlorine.
  • Aryl means a monovalent, monocyclic or bicyclic, aromatic carbocyclic hydrocarbon preferably a 6-10 member aromatic ring system.
  • Preferred aryl groups include, but are not limited to, phenyl, naphthyl, tolyl, and xylyl.
  • Heteroaryl means an aromatic heterocyclic ring system containing up to two rings.
  • Preferred heteroaryl groups include, but are not limited to, thienyl, furyl, indolyl, pyrrolyl, pyridinyl, pyrazinyl, oxazolyl, thiaxolyl, quinolinyl, pyrimidinyl, imidazole and tetrazolyl.
  • aryl or heteroaryl which are bicyclic it should be understood that one ring may be aryl while the other is heteroaryl and both may be substituted or unsubstituted.
  • Heterocycle means a substituted or unsubstituted 5 to 8 membered, mono- or bicyclic, non-aromatic hydrocarbon, wherein 1 to 3 carbon atoms are replaced by a hetero atom selected from nitrogen, oxygen or sulfur atom. Examples include pyrrolidin-2-yl; pyrrolidin-3-yl; piperidinyl; morpholin-4-yl and the like.
  • Hetero atom means an atom selected from N, O and S.
  • Alkoxy, alkoxyl or lower alkoxy refers to any of the above lower alkyl groups attached to an oxygen atom.
  • Typical lower alkoxy groups include methoxy, ethoxy, isopropoxy or propoxy, butyloxy and the like.
  • Further included within the meaning of alkoxy are multiple alkoxy side chains, e.g. ethoxy ethoxy, methoxy ethoxy, methoxy ethoxy ethoxy and the like and substituted alkoxy side chains, e.g., dimethylamino ethoxy, diethylamino ethoxy, dimethoxy-phosphoryl methoxy and the like.
  • “Pharmaceutically acceptable,” such as pharmaceutically acceptable carrier, excipient, etc., means pharmacologically acceptable and substantially non-toxic to the subject to which the particular compound is administered.
  • “Pharmaceutically acceptable salt” refers to conventional acid-addition salts or base-addition salts that retain the biological effectiveness and properties of the compounds of the present invention and are formed from suitable non-toxic organic or inorganic acids or organic or inorganic bases.
  • Sample acid-addition salts include those derived from inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, sulfamic acid, phosphoric acid and nitric acid, and those derived from organic acids such as p-toluenesulfonic acid, salicylic acid, methanesulfonic acid, oxalic acid, succinic acid, citric acid, malic acid, lactic acid, fumaric acid, trifluoro acetic acid and the like.
  • inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, sulfamic acid, phosphoric acid and nitric acid
  • organic acids such as p-toluenesulfonic acid, salicylic acid, methanesulfonic acid, oxalic acid, succinic acid, citric acid, malic acid, lactic acid, fumaric acid, trifluoro acetic
  • Sample base-addition salts include those derived from ammonium, potassium, sodium and, quaternary ammonium hydroxides, such as for example, tetramethylammonium hydroxide.
  • Chemical modification of a pharmaceutical compound (i.e. drug) into a salt is a technique well known to pharmaceutical chemists to obtain improved physical and chemical stability, hygroscopicity, flowability and solubility of compounds. See, e.g., Ansel et al., Pharmaceutical Dosage Forms and Drug Delivery Systems (6th Ed. 1995) at pp. 196 and 1456-1457.
  • the compounds of formulas I and II as well as their salts that have at least one asymmetric carbon atom may be present as racemic mixtures or different stereoisomers.
  • the various isomers can be isolated by known separation methods, e.g., chromatography.
  • the compounds of the present invention are useful in the treatment or control of cell proliferative disorders, in particular oncological disorders. These compounds and formulations containing said compounds may be particularly useful in the treatment or control of solid tumors, such as, for example, breast, colon, lung and prostate tumors.
  • a therapeutically effective amount of a compound in accordance with this invention means an amount of compound that is effective to prevent, alleviate or ameliorate symptoms of disease or prolong the survival of the subject being treated. Determination of a therapeutically effective amount is within the skill in the art.
  • the therapeutically effective amount or dosage of a compound according to this invention can vary within wide limits and may be determined in a manner known in the art. Such dosage will be adjusted to the individual requirements in each particular case including the specific compound(s) being administered, the route of administration, the condition being treated, as well as the patient being treated. In general, in the case of oral or parenteral administration to adult humans weighing approximately 70 Kg, a daily dosage of about 10 mg to about 10,000 mg, preferably from about 200 mg to about 1,000 mg, should be appropriate, although the upper limit may be exceeded when indicated. The daily dosage can be administered as a single dose or in divided doses, or for parenteral administration; it may be given as continuous infusion.
  • Formulations of the present invention include those suitable for oral, nasal, topical (including buccal and sublingual), rectal, vaginal and/or parenteral administration.
  • the formulations may conveniently be presented in unit dosage form and may be prepared by any methods well known in the art of pharmacy.
  • the amount of active ingredient which can be combined with a carrier material to produce a single dosage form will vary depending upon the host being treated, as well as the particular mode of administration.
  • the amount of active ingredient which can be combined with a carrier material to produce a single dosage form will generally be that amount of a formula I or II compound which produces a therapeutic effect. Generally, out of one hundred percent, this amount will range from about 1 percent to about ninety-nine percent of active ingredient, preferably from about 5 percent to about 70 percent, most preferably from about 10 percent to about 30 percent.
  • Methods of preparing these formulations or compositions include the step of bringing into association a compound of the present invention with the carrier and, optionally, one or more accessory ingredients.
  • the formulations are prepared by uniformly and intimately bringing into association a compound of the present invention with liquid carriers, or finely divided solid carriers, or both, and then, if necessary, shaping the product.
  • Formulations of the invention suitable for oral administration may be in the form of capsules, cachets, sachets, pills, tablets, lozenges (using a flavored basis, usually sucrose and acacia or tragacanth), powders, granules, or as a solution or a suspension in an aqueous or non-aqueous liquid, or as an oil-in-water or water-in-oil liquid emulsion, or as an elixir or syrup, or as pastilles (using an inert base, such as gelatin and glycerin, or sucrose and acacia) and/or as mouth washes and the like, each containing a predetermined amount of a compound of the present invention as an active ingredient.
  • a compound of the present invention may also be administered as a bolus, electuary or paste.
  • Effective amount means an amount that is effective to prevent, alleviate or ameliorate symptoms of disease or prolong the survival of the subject being treated.
  • IC50 refers to the concentration of a particular compound required to inhibit 50% of a specific measured activity. IC 50 can be measured, inter alia, as is described subsequently.
  • the present invention provides novel methods for the synthesis of spiroindolinones of formulas I and II.
  • Compounds of this invention can be synthesized according to the following general schemes. Suitable processes for synthesizing these compounds are provided in the examples.
  • An intermediate of formula III can be made from a base-catalyzed condensation reaction of appropriately selected substituted 2-oxindole and substituted benzaldehyde in methanol.
  • the choice of bases includes but is not limited to pyrrolidine or piperidine.
  • the reaction generates III as a mixture of Z- and E-isomers with E-isomer as the major product.
  • spiroindolinones of formula IV and its enantiomer IV′ as a racemic mixture can be made from intermediates II and III by the 1,3-dipolar cylcoaddition reaction mediated by lewis acid AgF and triethylamine, immediately followed by an isomerization reaction using DBU as the base in tert-butanol at an elevated temperature of 100° C. to 150° C.
  • the [2+3] cycloaddition reactions of azomethine ylides 1,3-dipoles with olefinic dipolarphiles to form pyrrolidine ring formation have been described in published procedures including Jorgensen, K. A. et at ( Org. Lett.
  • Racemic mixtures of compounds IV and IV′ are subsequently converted to racemic mixture of acid V and V′ by deprotection reaction using trifluoroacetic acid, followed by amide formation with various aryl or heteroaryl amines using diphenylphsphinic chloride as the coupling reagent to give the racemic mixture of compounds in formula I and I′.
  • the racemic mixture of compounds I and I′ can be chirally separated using chiral Super Fluid Chromatography (SFC) or chiral HPLC or chiral column chromatography to afford chirally pure
  • racemic mixture of intermediates pair IV and IV′, or V and V′ can also be chirally separated using chiral Super Fluid Chromatography (SFC) or chiral HPLC or chiral column chromatography to their corresponding optically pure or enriched form IV or V.
  • SFC Super Fluid Chromatography
  • Intermediates IV or V can be converted into analogues I in a similar manner by following the synthetic routes outlined in Scheme 3 without any further chiral separations.
  • the reaction mixture was stirred at room temperature for 1 h. The mixture was concentrated. The residue was partitioned between ethyl acetate and aqueous saturated NaHCO 3 solution. The organic layer was separated, washed with water, brine, dried over Na 2 SO 4 , then concentrated.
  • the reaction mixture was stirred at room temperature for 0.5 h. The mixture was concentrated. The residue was partitioned between ethyl acetate and aqueous saturated NaHCO 3 solution. The organic layer was separated, washed with water, brine, dried over Na 2 SO 4 , then concentrated.
  • the reaction mixture was stirred at room temperature for 0.5 h. The mixture was concentrated. The residue was partitioned between ethyl acetate and aqueous saturated NaHCO 3 solution. The organic layer was separated, washed with water, brine, dried over Na 2 SO 4 , then concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (30 mL), and DBU (4.0 g, 27 mmol) was added.
  • the reaction mixture was heated at 80° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (20 mL), and DBU (2.5 g, 16 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (30 mL), and DBU (33 g, 130 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (30 mL), and DBU (33 g, 130 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (30 mL), and DBU (34 g, 138 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (30 mL), and DBU (30 g, 120 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the mixture was stirred at room temperature for 18 h.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and brine.
  • the organic layer was separated, washed with water, dried over MgSO 4 , and concentrated.
  • the residue was dissolved into t-butanol (15 mL), and DBU (16 g, 65 mmol) was added.
  • the reaction mixture was heated at 120° C. for 2 h.
  • the mixture was then cooled to room temperature and concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate.
  • the organic layers were combined, washed with water, brine, dried over MgSO 4 , and concentrated.
  • the reaction mixture was stirred at room temperature for 18 h.
  • the mixture was concentrated, and the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and the aqueous layer was extracted with ethyl acetate twice.
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step A To a solution of methyl 3-hydroxy-4-nitrobenzoate (Aldrich) (3 g, 15.2 mmol) in anhydrous DMF (25 mL) were added NaH (Aldrich, 60%) (0.91 g, 22.8 mmol) and iodoethane (2.61 g, 16.7 mmol) sequentially. The reaction mixture was stirred at room temperature for 2 h. Water was added. The mixture was extracted with ethyl acetate. The organic extract was washed with water, brine, dried over MgSO 4 , and concentrated to give methyl 3-ethoxy-4-nitrobenzoate as a light yellow solid (1.0 g, 29%).
  • Step B A suspension of methyl 3-ethoxy-4-nitrobenzoate (1 g, 4.4 mmol) and Pd/C (Aldrich, 10%, 0.1 g) in ethyl acetate (25 mL) was vigorously shaken in a Parr under atmosphere of H 2 (50 psi) for 0.5 h. The mixture was filtered through a short pad of celite. The filtrate was concentrated to give 4-amino-3-ethoxy-benzoic acid methyl ester as a light yellow oil (0.8 g, 92%).
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the reaction mixture was heated at 80° C. for 1 h.
  • the mixture was cooled to room temperature, then partitioned between ethyl acetate and water.
  • the organic layer was separated, and aqueous layer was extracted with ethyl acetate twice.
  • the combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step A To a solution of 4-fluoro-2-methoxy-1-nitrobenzene (Combi-blocks, 3.4 g, 19.9 mmol) in DMSO (40 mL) was added an aqueous solution (1N) of NaOH (40 mL, 40 mmol). The reaction mixture was heated at 80° C. for 20 h. The mixture was cooled to room temperature, and the “pH” of the solution was adjusted to 5 by aqueous HCl solution. The mixture was extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated to give 3-methoxy-4-nitrophenol as a light yellow solid (3.2 g, 95%).
  • Step B To a solution of 3-methoxy-4-nitrophenol (1 g, 5.9 mmol) in anhydrous DMF (25 mL) were added K 2 CO 3 (2.45 g, 17.7 mmol) and (2-bromoethoxy)(tert-butyl)dimethylsilane (1.7 g, 7.1 mmol) sequentially.
  • the reaction mixture was heated at 70° C. for 20 h.
  • the mixture was cooled to room temperature, and diluted with water.
  • the mixture was extracted with ethyl acetate three times.
  • the combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step C A suspension of tert-butyl-[2-(3-methoxy-4-nitro-phenoxy)-ethoxy]-dimethyl-silane (1 g, 3.05 mmol) and Pd/C (Aldrich, 10%, 0.1 g) in ethyl acetate (25 mL) was vigorously shaken in a Parr under atmosphere of H 2 (50 psi) for 0.5 h. The mixture was filtered through a short pad of celite. The filtrate was concentrated to give 4-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-2-methoxy-phenylamine as a light yellow oil (0.9 g, 99%).
  • the reaction mixture was stirred at room temperature for 0.5 h.
  • the mixture was filtered through a short pad of celite.
  • the mixture was concentrated.
  • the residue was partitioned between ethyl acetate and water.
  • the organic layer was separated, and aqueous layer was extracted with ethyl acetate.
  • the combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step A To a solution of 3-butoxy-4-nitrobenzoic acid (City Chemicals) (2.5 g, 10.5 mmol) in methanol (10 mL) were added concentrated H 2 SO 4 (1 g, 10.5 mmol). The reaction mixture was heated at reluxing for 2 h. The mixture was concentrated. The residue was partitioned between ethyl acetate and water. The organic layer was separated, and aqueous layer was extracted with ethyl acetate twice. The combined organic extract was washed with water, aqueous saturated NaHCO 3 solution, brine, dried over MgSO 4 , and concentrated to give methyl 3-butoxy-4-nitrobenzoate as a brown oil (2.5 g, 95%).
  • 3-butoxy-4-nitrobenzoic acid City Chemicals
  • Step B A solution of methyl 3-butoxy-4-nitrobenzoate (2.5 g, 9.9 mmol) in methanol (100 mL) was added an aqueous solution (50 mL) of NH 4 Cl (5.3 g, 99 mmol), followed by activated zinc (Aldrich, 6.5 g, 99 mmol). The reaction mixture was stirred at room temperature for 1 h. The mixture was filtered through a short pad of celite. The mixture was concentrated. The residue was partitioned between ethyl acetate and water. The organic layer was separated, and aqueous layer was extracted with ethyl acetate. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated to give 4-amino-3-butoxy-benzoic acid methyl ester as a yellow solid (1.8 g, 82%).
  • the crude mixture was diluted with water (5 mL), and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the reaction mixture was heated at 80° C. for 1 h.
  • the mixture was cooled to room temperature, then partitioned between ethyl acetate and water.
  • the organic layer was separated, and aqueous layer was extracted with ethyl acetate twice.
  • the combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step A To a solution of 4-hydroxytetrahydropyran (4.5 g, 44 mmol) (Aldrich) in dichloromethane (90 mL) at 0° C. was added triethylamine (5.4 g, 53 mmol), and methanesulfonyl chloride (3.73 mL, 48 mmol, Aldrich). The reaction mixture was stirred at 0° C. for 1 h, then at room temperature for 1.5 h. The mixture was poured into water, extracted with dichloromethane.
  • Step B To a solution of 3-methoxy-4-nitrophenol (0.5 g, 3 mmol) prepared in Example 132 Step A in anhydrous DMF (13 mL) were added Cs 2 CO 3 (2.9 g, 8.9 mmol) and methanesulfonic acid tetrahydropyran-4-yl ester (0.64 g, 3.6 mmol) sequentially. The reaction mixture was heated at 120° C. for 3 h. The mixture was cooled to room temperature, and diluted with water. The mixture was extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated. The residue was purified by chromatography (40-60% EtOAc in hexanes) to give 4-(3-methoxy-4-nitrophenoxy)tetrahydro-2H-pyran as a yellow oil (0.4 g, 53%).
  • Step C A suspension of 4-(3-methoxy-4-nitrophenoxy)tetrahydro-2H-pyran (0.4 g, 1.6 mmol) and Pd/C (Aldrich, 10%, 0.1 g) in ethyl acetate (10 mL) was vigorously shaken in a Parr under atmosphere of H 2 (50 psi) for 0.5 h. The mixture was filtered through a short pad of celite. The filtrate was concentrated to give 2-methoxy-4-(tetrahydro-pyran-4-yloxy)-phenylamine as a light yellow oil (0.3 g, 85%).
  • Step A To a solution of 3-methoxy-4-nitrobenzoic acid (Alfa) (10 g, 51 mmol) in toluene (75 mL) was added SOCl 2 (11.5 g, 97 mmol), and a catalytic amount of DMF. The mixture was heated at refluxing for 3 h, then cooled to room temperature. The mixture was concentrated. The residue was dissolved into tetrahydrofuran (125 mL) and triethylamine (8.4 g, 83 mmol), and the temperature of the mixture was lowered to 0° C.
  • Alfa 3-methoxy-4-nitrobenzoic acid
  • Step B To a reluxing solution of triethylamine (10.5 mL, 22.5 mmol) and silver benzoate (3.78 g, 22.5 mmol) in tert-butanol (100 mL) and toluene (100 mL) at 120° C. was added a tert-butanol solution (80 mL) of 2-diazo-1-(3-methoxy-4-nitro-phenyl)-ethanone (5 g, 22.5 mmol). The reaction mixture was heated at 120° C. for 1 h. The mixture was cooled to room temperature, and filtered through a short pad of celite.
  • Step C A suspension of (3-methoxy-4-nitro-phenyl)-acetic acid tert-butyl ester (3 g, 11.2 mmol) in methanol (100 mL) was added an aqueous solution (50 mL) of NH 4 Cl (6 g, 112 mmol), followed by activated zinc (Aldrich, 7.3 g, 112 mmol). The reaction mixture was stirred at room temperature for 0.5 h. The mixture was filtered through a short pad of celite. The mixture was concentrated. The residue was partitioned between ethyl acetate and water. The organic layer was separated, and aqueous layer was extracted with ethyl acetate.
  • the reaction mixture was heated at 80° C. for 3 h.
  • the mixture was cooled to room temperature, then partitioned between ethyl acetate and water.
  • the organic layer was separated, and aqueous layer was extracted with ethyl acetate twice.
  • the combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • the crude mixture was diluted with water, and acidified to “pH” 5-6 by dilute aqueous HCl solution. The mixture was then extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • Step A To a solution of 3-methoxy-4-nitrophenol (0.5 g, 3 mmol) prepared in Example 132 Step A in anhydrous DMF (13 mL) were added K 2 CO 3 (0.8 g, 5.9 mmol) and 1-Chloro-2-methylsulfanyl-ethane (Aldrich)(0.65 g, 5.9 mmol) sequentially. The reaction mixture was heated at 70° C. for 2 h. The mixture was cooled to room temperature, and diluted with water. The mixture was extracted with ethyl acetate three times. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated.
  • K 2 CO 3 0.8 g, 5.9 mmol
  • 1-Chloro-2-methylsulfanyl-ethane Aldrich
  • Step B A suspension of 2-methoxy-4-(2-methylsulfanyl-ethoxy)-1-nitro-benzene (0.25 g, 1.0 mmol) in methanol (8 mL) was added an aqueous solution (4 mL) of NH 4 Cl (0.55 g, 10 mmol), followed by activated Zinc (Aldrich, 0.67 g, 10 mmol). The reaction mixture was stirred at room temperature for 0.5 h. The mixture was filtered through a short pad of celite. The mixture was concentrated. The residue was partitioned between ethyl acetate and water. The organic layer was separated, and aqueous layer was extracted with ethyl acetate. The combined organic extract was washed with water, brine, dried over MgSO 4 , and concentrated to give 2-methoxy-4-(2-methylsulfanyl-ethoxy)-phenylamine as a brown oil (0.2 g, 91%).

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